Summary
The variation with energy and with Feynman’s variablex of the production of ψ and ψ’ is a sensitive test of their production mechanism. A simple parton model predicts that at relatively low energies production nearx=0 is strongly favoured and that the invariant crosssection atx=0 increases by two orders of magnitude between BNL and ISR energies. A sharp increase is also predicted for the ratio of ψ or ψ’ production to the nonresonant lepton pair background.
Riassunto
La variazione della produzione di ψ e ψ’ con l’energia e con la variabilex di Feynman è un test sensibile del loro meccanismo di produzione. Un semplice modello a partoni predice che ad energie relativamente basse la produzione pressox=0 è fortemente favorita e che la sezione d’urto adx=0 aumenta di due ordini di grandezza fra la energia del BNL e quella degli ISR. Si predice anche un netto incremento per il rapporto tra la produzione di ψ o ψ’ e il fondo di coppie leptoniche non risonante.
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Green, M.B., Jacob, M. & Landshoff, P.V. Production of the new resonances in hadronic collisions. Nuov Cim A 29, 123–139 (1975). https://doi.org/10.1007/BF02735416
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DOI: https://doi.org/10.1007/BF02735416